Pointers or indirect addressing question

hi

I have MW300 integer value.

If MW300= 400 then I want PIW400 value to be transfered to MW302.

If MW300= 500 then I want PIW500 value to be transfered to MW 302.

Plc will always read MW 300 value and PIW[MW300] will be always transfered to MW302.

How can I do it?

Can you help me about program side?

Thanks alot for all kind of help.

Hello,

Do you know PIW is periphreal address of input. It is not clear what you want to achieve? Do you want to read pheriphreal address? What is PIW400 & PIW500? Do you want to transfer data of MW300 when it matched data value of PIW400 or PIW 500 to MW302?

Do you want to read pheriphreal address? Yes.

What is PIW400 & PIW500? Pheriphreal addresses.

Do you want to transfer data of MW300 when it matched data value of PIW400 or PIW 500 to MW302? No.

I will read value of MW300.

Example1: Lets say that MW300 = 100.

In this case I want to move value of PIW100 to MW302.

Example2: Lets say that MW300 = 256.

In this case I want to move value of PIW256 to MW302.

Analog input values will be transferred to MW302 according to MW300 value.

 I know that its strange request but this is what I need.

On hmi screen electrician will write MW300 value, indeed he will write which address he want to read, and then in MW302 he will read the value. thus he will check analog input value from hmi.

I can not show all analog input values on hmi because there are thousands of analog inputs in the factory.

Osman_

hi

I have MW300 integer value.

If MW300= 400 then I want PIW400 value to be transfered to MW302.

If MW300= 500 then I want PIW500 value to be transfered to MW 302.

Plc will always read MW 300 value and PIW[MW300] will be always transfered to MW302.

How can I do it?

Can you help me about program side?

Thanks alot for all kind of help.

Hello.

The answer is borrowed from a great expert..
https://support.industry.siemens.com/tf/WW/en/posts/bypost/?postId=357628#post357628

// REGSTER-INDIRECT AREA-INTERNAL ADDRESSING
L     MW300
SLD   3
LAR1
L     PIW[AR1,P#0.0]
T     MW302

Osman_

thanks alot

[https://www.deviantart.com/kiki-akuma/art/Thanks-Alot-205399955]

Thank you for your note Osman.
I do appreciate it a lot.
Your note is most appreciated.
Your note is highly valued.

I tested, it's working.

This will help me alot. Thank you

If I enter invalid value to MW300, then cpu's SF led goes to red. it's normal.. I loaded related OB so plc does not go to stop mode.